Mohid Swan

In this wiki it would be commented how to implement the Swan model into the Mohid modelling software.

Software Needed

In addition to the Mohid model it will be needed the following software to achive the goal.

• Swan Model
• Matlab
• SIGMA - A SWAN Graphical Interface in MATLAB (Optional)

Bathymetry

The bathymetry should be converted from the Mohid format to the Swan format using the software mohidbatim2swan.m. that would convert the file from the extension .dat to the extension .bty

The bathymetry resolution should be betwwen 1 km or 2 km while for the WaveWatch III software the resolution is around 5 km.

The bathymetry should be visualised using notepad or a software called sigma that needs to be localed in the root directory c:\

Sigma -> Task File -> Show so far -> Linha CGWID

Boundary Conditions

The Swan model would need of wind, tide and deep-Ocean swell as boundary conditions.

Wind

Wind vectors should also be provided from other model results (i.e. MOHID, MM5 or WRF) and then converted to the SWAN format using ConvertToHDF5 using the option "ConvertHDF5ToSWANorMOHID" that will provide a hourly file with values for x and y directions, be aware of the file size.

Tide

The tide sould be obtained from other models (i.e. PCOMS), or calculated (i.e. Tideprev) and interpolated to the grid.

SWAN Model Input

Sect 3
CGRID is the origin, starting from the lower left corner
0   -> Rotation (0 no inclination)
1.3 -> Grid step x in degrees
2   -> Grid step y in degrees
130 -> cells -1 in X direction
200 -> cells -1 in Y direction
CIR -> Whole circle of directions
36  -> Number of directions
0.04 -> Minimum frequency
0.5 -> Maximum frequency
50 -> Number of frequencies -1 (in total then 51)

Sect 4
Equal to Sect 3 but dx = 0.01 = dy
wlevel.in
wind.in

Sect 5
WavewatchIII
BOUN (boundary) SIDE W CONST PAS 5 10 210 30
                                 H  T Dir Dispersion 

Sect 6 Physics
Do not change

Sect 8 Time series
To obtain a window it should be edited 
NGRID Indicating the lower left cell for the new grid, the size of the grid in x and y and the number of cells
SUBG Indicates the subgrid and in should be provided the lower left corner of the father grid

Sect 10 
It makes the domain 4 times and when reach the 98% probability then stops.
Defines the initial and final date
It should be defined a day as the initial date

Running Swan

Input and the exe file should be located in the same folder.

SWAN Model Output

To be viewed in Matlab .tbl X Y DEP HS DIR PER FOR WIND

Also can be used the ConvertToHDF5 with the option ConvertToAndFromSWAN